Using all letters

                                                                           multimillion

                                                                          The other words:

                                                                               ilium

                                                                              intuit

                                                                             intuition

                                                                              intuito

                                                                              ionium

                                                                               linum

                                                                              minimum

                                                                              moulin

                                                                               moult

                                                                               mount

                                                                              mouton

                                                                              mullion

                                                                               multi

                                                                               multo

                                                                             munition

                                                                              mutton

                                                                              muumuu

                                                                             nonunion

                                                                               nullo

                                                                              omnium

                                                                              toluol

                                                                              tuition

                                                                              tumult

                                                                               tutti

                                                                              ultimo

                                                                               union

                                                                               unlit

                                                                               until